20007318520 has 64 divisors (see below), whose sum is σ = 51744899520. Its totient is φ = 6819984384.

The previous prime is 20007318473. The next prime is 20007318553. The reversal of 20007318520 is 2581370002.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158077 + ... + 254956.

It is an arithmetic number, because the mean of its divisors is an integer number (808514055).

Almost surely, 2^20007318520 is an apocalyptic number.

20007318520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20007318520 is an abundant number, since it is smaller than the sum of its proper divisors (31737581000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20007318520 is a wasteful number, since it uses less digits than its factorization.

20007318520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413224 (or 413220 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 20007318520 its reverse (2581370002), we get a palindrome (22588688522).

The spelling of 20007318520 in words is "twenty billion, seven million, three hundred eighteen thousand, five hundred twenty".